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LernerPython blog, from Reuven Lerner: Pandas groupby on datetime parts with the dt accessor
If your Python Pandas data frame has a datetime column, you can group on a portion of that via the “dt” accessor.For example, let’s get mean trip_distance for each hour of the day:df.groupby(df['tpep_pickup_datetime'].dt.hour)['trip_distance'].mean()